Defence to Blackwood InterferenceAny of a variety of methods to cope with enemy interference over Blackwood (or Gerber.) Each is commonly known by its acronym, e.g. DOPI, ROPI, PODI, etc. Using DOPI and as examples:
Note: DOPI stands for "Double-Zero, Pass-One", and ROPI stands for "Redouble-Zero, Pass-One". |